/Engine/Source/Runtime/InteractiveToolsFramework/Public/InteractiveToolQueryInterfaces.h
IInteractiveToolExclusiveToolAPIprovides an API to inform the ToolManager about tool exclusivity. An exclusive tool prevents other tools from building & activating while the tool is active. This is useful in scenarios where tools want to enforce an explicit Accept, Cancel or Complete user input to exit the tool.
class IInteractiveToolExclusiveToolAPI